JP2009248183A - Pinch roll for cold-rolled steel strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pinch roll for cold-rolled steel strips, with which sufficient tension is imparted, defects on the surface of the steel strip are prevented and also the increase of cost is not brought about. <P>SOLUTION: The pinch roll for cold-rolled steel strips is composed of a pair of upper and lower rolls and respective rolls are movable in the vertical direction with respect to the pass line of the cold-rolled steel strip. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pinch roll for a cold-rolled steel strip used in a line for batch-processing cold-rolled steel strip such as an electrolytic cleaning line, a temper rolling line, and a recoil line.

  In batch processing of cold-rolled steel strip such as electrolytic cleaning line, temper rolling line, recoil line, etc., the cold-rolled steel strip wound in a coil shape is unwound from the payoff reel and subjected to the desired treatment. After that, it is wound up with a tension reel. At this time, the steel strip is transported in a state where tension (tension) is applied by the tension reel and the tension pad, but when the tail end of the steel strip is released from the payoff reel, the tail end and the vicinity thereof are Since it is in a tension-free state, it runs meandering or hitting a wave, so that the intended processing cannot be performed. Therefore, a pinch roll consisting of a pair of upper and lower rolls for sandwiching the steel strip is placed in the vicinity of the device for performing the intended treatment, immediately before the tail end of the steel strip is released from the payoff reel, Measures are taken to pinch the steel strip with this pinch roll and apply tension to the steel strip to reduce the portion of the steel strip that cannot be treated as much as possible, that is, to improve the yield.

  As an example, FIG. 2 schematically shows a recoil line provided with such a conventional pinch roll.

  The pinch roll 50 is composed of a lower roll 52 fixed to the pass line and an upper roll 51 movable in a direction perpendicular to the pass line, and immediately before the tail end of the steel strip 1 is released from the payoff reel 2, until then. The upper roll 51 evacuated above the pass line is lowered, and the steel strip 1 is sandwiched between the lower roll 52 fixed to the pass line. Therefore, even after the tail end of the steel strip 1 is released from the payoff reel 2, the steel strip 1 is tensioned with the tension reel 4, so that the portion of the steel strip 1 cut off by the shear 3 is reduced as much as possible. Will be able to.

  Normally, the upper and lower rolls 51 and 52 are both driven by a motor with a capacity of about 11 kw, and the reduction ratio of the lower roll 52 (the number of rotations of the roll relative to the number of rotations of the motor 1) is the transport speed of the steel strip 1 (up to 300 mpm) The reduction ratio of the upper roll 51 is 1/2 so that the conveyance speed of the steel strip can be reduced immediately before the tail end of the steel strip 1 is released from the payoff reel 2. It is adjusted to about 30.

  However, since the reduction ratio of the lower roll is about 1/6 and the reduction ratio of the upper roll is about 1/30, the reduction ratio is so small that sufficient tension cannot be applied. In order to apply sufficient tension, for example, the motor capacity of the upper roll can be increased to about 55 kw, but this causes a significant cost increase. Further, since the lower roll is fixed to the pass line, the steel strip has to be in constant contact with the lower roll, so that there is a problem that the surface of the steel strip is easily scratched and the yield is reduced.

  An object of this invention is to provide the pinch roll for cold-rolled steel strips which can provide sufficient tension, can prevent the steel strip surface from being scratched, and does not increase the cost.

  This object is achieved by a pinch roll for a cold-rolled steel strip that consists of a pair of upper and lower rolls, each roll being movable in a direction perpendicular to the pass line of the cold-rolled steel strip.

  By applying the pinch roll for cold-rolled steel strip of the present invention to a batch processing line for cold-rolled steel strip, sufficient tension can be applied without causing cost increase, and scratches on the steel strip surface can be prevented. It was. For this reason, the yield of batch processing was greatly improved.

  FIG. 1 schematically shows a recoil line provided with the pinch roll of the present invention.

  In this recoil line, the lower roll 52 fixed to the pass line in the conventional pinch roll shown in FIG. 2 is movable in a direction perpendicular to the pass line. Therefore, when the pinch roll 50 is not used, both the upper roll 51 and the lower roll 52 are retracted from the pass line, and when the pinch roll 50 is used, that is, immediately before the tail end of the steel strip 1 is released from the payoff reel 2. Since the upper roll 51 and the lower roll 52 only need to be arranged in the pass line only when the conveying speed of the steel strip 1 is reduced, the reduction ratio of the upper roll 51 and the lower roll 52 can be increased, for example, about 1/60, Sufficient tension can be applied without increasing the motor capacity, that is, without increasing the cost. Further, since the lower roll 52 is not always fixed to the pass line, the steel strip 1 is not always in contact with the lower roll 52, and scratches on the surface of the steel strip 1 can be prevented.

  Furthermore, since the operation of the upper and lower rolls is vertically symmetric, there is a merit that the roll peripheral speed can be easily adjusted.

  In fact, a pinch roll consisting of upper and lower rolls that can move in the direction perpendicular to the pass line is installed on the recoil line shown in Fig. 1, and the steel strip is transported immediately before the tail end of the steel strip is released from the payoff reel. Only when decelerating the speed, the upper and lower rolls were driven with a reduction ratio of 1/59 by a motor with a capacity of 11 kw and tension was applied for one month operation. Only when the lower roll is always driven with a reduction ratio of 1/6 by a fixed 11kw motor, and the upper roll decelerates the transport speed of the steel strip just before the tail end of the steel strip is released from the payoff reel. Compared to driving at a reduction ratio of 1/30, the amount of steel strip coil tail ends was reduced, scratches were prevented, and a yield improvement of 0.22% was achieved.

It is a figure which shows typically the recoil line which installed the pinch roll of this invention. It is a figure which shows typically the recoil line which installed the conventional pinch roll.

Explanation of symbols

1 Steel strip
2 Payoff reel
3 Shah
4 Tension reel
50 pinch rolls
51 Pinch roll top roll
52 Pinch roll under roll

Claims (1)

  A pinch roll for cold-rolled steel strip that consists of a pair of upper and lower rolls, and each roll can move in a direction perpendicular to the pass line of the cold-rolled steel strip.

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